真空辅助法合成Fe3（PO4）2·8H2O及对LiFePO4/C结构、形貌和电化学性能的影响

doi:10.3866/PKU.WHXB201403041

Abstract

Abstract:

A vacuum-assisted precipitation method was used to synthesize Fe₃(PO₄)₂·8H₂O (FP). The FP was then used to synthesize carbon-coated LiFePO₄ (LFP/C) particles. The influence of FP on the structure, morphology, and electrochemical performance of LFP was investigated. The X-ray diffraction (XRD) patterns and molar ratio of Fe to P showed that the FP which was produced using a vacuum-assisted method was of high purity and gave highly crystalline, impurity-free LFP. Scanning electron microscopy (SEM) showed that the FP contained undeveloped particles. The undeveloped FP results in uniform LFP/C particles, without agglomeration. Transmission electron microscopy (TEM) showed that the LFP particles were coated with a homogeneous carbon layer. The LFP/C showed excellent discharge capacities of 140, 113, and 100 mAh·g^-1 at 1C, 10C, and 20C rates, respectively. The cyclic voltammograms (CVs) of LFP showed a low polarization voltage and sharp redox peaks. The charge-discharge platform curves showed that LFP had an excellent high-rate capability. Electrochemical impedance spectroscopy (EIS) tests showed that the lithium-ion diffusion coefficients of LFP/C produced with and without vacuum assistance were 1.42×10^-13 and 4.22×10^-14 cm²·s^-1, respectively, proving that vacuum assistance can improve the diffusion coefficients of LFP/C.

Key words: Fe₃（PO₄）₂·, 8H₂O, LiFePO₄/C, Vacuum-assistance, Precipitation, High rate

MSC2000:

O646

REN Jian-Xin, HU You-Kun, GUO Xiao-Dong, TANG Yan, ZHONG Ben-He, LIU Heng. Vacuum-Assisted Synthesis of Fe₃(PO₄)₂·8H₂O and Its Influence on Structure, Morphology and Electrochemical Performance of LiFePO₄/C[J].Acta Phys. -Chim. Sin., 2014, 30(5): 866-872.

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Vacuum-Assisted Synthesis of Fe₃(PO₄)₂·8H₂O and Its Influence on Structure, Morphology and Electrochemical Performance of LiFePO₄/C

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Vacuum-Assisted Synthesis of Fe3(PO4)2·8H2O and Its Influence on Structure, Morphology and Electrochemical Performance of LiFePO4/C

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Vacuum-Assisted Synthesis of Fe₃(PO₄)₂·8H₂O and Its Influence on Structure, Morphology and Electrochemical Performance of LiFePO₄/C